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Note 3 - Acquisitions for Common Units (Details Textual)
$ in Thousands
 2 Months Ended 9 Months Ended
Aug. 29, 2025
USD ($)
a
shares
Sep. 30, 2024
USD ($)
a
shares
Mar. 28, 2024
USD ($)
a
shares
Aug. 27, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
a
Dec. 31, 2024
USD ($)
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received         $ 3,353 $ 11,301  
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion         $ 267,111   $ 298,011
Number Of Counties In Which Entity Operates         594    
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Adams County, Colorado [Member]              
Area of Real Estate Property (Acre) | a 3,050            
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares 915,694            
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable $ 23,000            
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received       $ 700 $ 1,200    
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion         19,000    
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in New Mexico and Texas [Member]              
Area of Real Estate Property (Acre) | a   14,225       14,225  
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares   6,721,144          
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable   $ 202,600          
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received         $ 1,900 $ 5,800  
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion             193,700
Number Of Counties In Which Entity Operates   14       14  
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Weld County, Colorado [Member]              
Area of Real Estate Property (Acre) | a   1,204       1,204  
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares   530,000          
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable   $ 16,000          
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received           $ 900  
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion             14,600
Multiple Unrelated Third Party [Member] | Mineral and Royalty Interest in Colorado [Member]              
Area of Real Estate Property (Acre) | a     1,485        
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares     505,369        
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable     $ 17,000        
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received           $ 4,400  
Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion             $ 12,300
Number Of Counties In Which Entity Operates     2